docs/install/bbb_ehci.html: re-license to GFDL

I received the authors permission to change the license, via IRC
and email messages.

IRC log (#libreboot freenode IRC) on 11 July 2015:
<francis7> tty0_, I sent you an email.
<francis7> (your gmail address)
<tty0_> There isn't that much work of mine there, and i am ok
with what you will decide. But i would protest GFDL if i was in
your place
<francis7> tty0_, does this mean that you accept GFDL?
<tty0_> I give you permission to do it if you decide that it is
the best option for libreboot

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